Spin–Orbit Interaction and Induced Superconductivity in a One-Dimensional Hole Gas

• DOI: 10.1021/acs.nanolett.8b02981
• Publication Date: 2018-09-07T15:25:38Z
• Authors: Folkert K. de Vries; Jie Shen; Rafal J. Skolasinski; Michal P. Nowak; Daniel Varjas; Lin Wang; Michael Wimmer; Joost Ridderbos; Floris A. Zwanenburg; Ang Li; Sebastian Koelling; Marcel A. Verheijen; Erik P. A. M. Bak...; Leo P. Kouwenhoven
• Keywords: Topological insulator; Andreev reflection

Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted much interest in the search for topological superconductors. Both SOI hard superconducting gap are directly related to protection of predicted Majorana bound states. Here we explore one-dimensional hole gas germanium silicon (Ge-Si) core-shell nanowires (NWs) as a new material candidate creating superconductor. Fitting multiple Andreev reflection measurements shows that NW has two transport channels only, underlining its one-dimensionality. Furthermore, find anisotropy Lande g-factor, that, combined band structure calculations, provides us qualitative evidence direct Rashba orbital effect magnetic field. Finally, is found tunneling regime, open where use Kondo peak tool gauge quality gap.